…1532)

* Create .keep

* update .keep path

* add rl_pong example

* move to rl_pong direction

* remove original file

* add parameter server example

* add license

* PEP8 checks

* PEP8 checks

* Add into integration test

* Wrap tests into bash function

* Update license

* PEP8 checks

* Correct syntax of rl_pong

* modify run-pytests to check version before test ray

* test pyspark version and spark home

* add check spark_home's pyspark in case pyspark can't be found

* add check version before run ray examples

* change spark home

* change spark home

* install packages which are needed in ray examples

* check error

* fix error

* change execution to spark-submit

* change memory

* change object memory to test

* add atari_py dependency

* remove .keep

* move ray test to new files

* change some ray-pip lines into function

* remove rl_pong and fix parameter_server iterations

* add iteration

* change iterate, print info

* add more info

* add __init__ files

* change ray to rayexample to avoid conflict and change spark-submit to python to submit tasks

* renamed foreach_evaluator to foreach_worker because rllib update and rename file rllib to rllibexample

* add a dedicated file for the ray test

* PEP8 check fix

* PEP8 check fix

* remove test_split

* remove --doctest-modules about ray

* add time.sleep

* pytorch doc

* update example

* remove transfomer

* doc and example update

* fix sample_input

* check none

* param update

* check trace